Portion of an operation controller for electronic computers



FIG. 1 is a top, front and right side perspective view of a portion of an operation controller for electronic computers showing my new design;

FIG. 2 is a right side elevational view thereof, the left side elevational view being a mirror image;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line showing of the remainder of the operation controller for electronic computers is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of an operation controller for electronic computers, as shown and described. 